UCD3138ARGCT

Overview

The UCD3138ARGCT is a fully programmable digital power controller from Texas Instruments, part of the UCD3138A series. It integrates a 32-bit ARM7TDMI-S RISC microcontroller with Fusion Digital Power Peripherals (FDPP). Key electrical parameters include a supply voltage range of 3 V to 3.6 V and an operating temperature range of -40°C to +125°C. The device features a dedicated Error Analog-to-Digital Converter (EADC), a 2-pole/2-zero digital compensator, and a Digital Pulse Width Modulator (DPWM) with 250 ps resolution. It is housed in a 64-VQFN package.

Feature Summary

• Integrates a 32-bit ARM7TDMI-S processor with specialized digital control peripherals for high-speed loop compensation.
• Features a dedicated Error ADC and DPWM with 250 ps pulse width resolution for precise power regulation.
• Supports flexible configuration via PMBus and UART interfaces for system monitoring and parameter adjustment.

Applications

• Isolated DC/DC modules
• AC/DC converters
• Power factor correction circuits

Procurement Notes

Verify the specific suffix 'RGCT' against the manufacturer datasheet to confirm the exact tape-and-reel packaging quantity and moisture sensitivity level. Ensure the design accounts for the 64-VQFN thermal requirements and the specified 3 V to 3.6 V supply voltage constraints during integration.

Selection Notes

Select this component when a highly integrated digital solution is required for complex power topologies. It is suitable for designs needing precise digital control loops and communication capabilities. Consider the 64-pin form factor and the need for external passive components for the analog front end when evaluating board space.

Part Context

This part belongs to the UCD3138 family of digital power controllers designed for IT and network infrastructure applications. It replaces older analog controllers by offering programmable logic and enhanced diagnostic features through its integrated microcontroller and peripheral set.

Replacement Considerations

Check for UCD3138 variants with different package options or suffixes if pin compatibility or thermal performance differs. Verify that alternative parts support the same ARM architecture and peripheral sets for firmware portability.

FAQ

What is the resolution of the Digital Pulse Width Modulator (DPWM)?

The UCD3138ARGCT features a DPWM with a pulse width resolution of 250 ps.

Does the UCD3138ARGCT support digital isolation?

Yes, the device supports digital isolation protocols, allowing it to interface with isolated gate drivers without requiring external optical isolators for certain configurations.